Grand House 59
Single-story house with a built-up area of 77 m²
Prefabricated timber frame house
Grand House 59
Year-Round Single-Storey House
Grand House 59 is a year-round, energy-efficient residential home with a non-usable attic and a building footprint of 77 m². The layout provides a comfortable living space including a vestibule, a spacious kitchen with living room, a bathroom, a utility room, and two bedrooms with large windows offering views of the garden.
Thanks to additional storage areas, this compact house offers everything needed for daily living. Space for technical equipment and storage is not an issue — a common problem in houses of similar size.
The building complies with the technical requirements defined by WT2021, meaning it is a fully year-round home, energy-efficient, and meets all criteria for construction with a full building permit.
This house cannot be built as a recreational building (BRI), nor does it meet the criteria for notification-based construction as a single-family residential building.
Purpose
Our modern single-storey barn-style house is an excellent solution for permanent living for a single person, couple, small family, or seniors. It also works well as a getaway house. Thanks to its functional layout, the house can also be easily adapted into a company office space.
Specifications
- Usable floor area:
- Building footprint:
- Building height:
- Ground floor height:
- External dimensions:
- 59 m²
- 77 m²
- 5,77 m
- 2,50 m
- 12,19x6,29 m
A Layout That Has It All
Despite its modest size, the house offers everything needed for year-round living: a spacious kitchen with living area, two bedrooms, a vestibule, a technical room, and a bathroom with space for a bathtub.
The technical room accommodates a washing machine and allows for the installation of larger sanitary equipment such as a heat pump, domestic hot water tank, or ventilation system with heat recovery.
The non-usable attic provides ideal storage for seasonal items.
Large glazed sections at the rear of the house ensure excellent natural light while maintaining privacy for the residents.
The thoughtful layout turns a compact footprint into a cozy and functional living space.
Grand House 59 is a home that, within its small area, delivers absolutely everything needed for comfortable permanent living. It stands out thanks to its well-thought-out room layout and functionality, which are rarely found in houses of this size.
Top-Quality Materials
The facade of our house is finished with spruce cladding. The roof is covered with modular metal roofing tiles. The window joinery includes six-chamber, triple-glazed windows, installed using the warm installation method.
The main insulation of the house consists of mineral wool or, optionally, Steico Zell blown-in wood fibre. The house is additionally insulated with Steico thermal insulation boards.
Floor Plans & Interior Visualizations
See the layout of our modern barn-style home.
For more detailed architectural materials, we encourage you to get in touch directly.
Interior Finish Options
Our prefabricated timber frame house design is available in three finishing options:
Closed Shell Stage
(net + 8% VAT)
- Wall structure without installation cavity (22 cm insulation)
- Roof, floor, and internal walls without boarding
- Spruce facade
- Roofing installation
- Window joinery
Developer Stage
(net + 8% VAT)
Includes Closed Shell Stage, plus:
- Installation cavity with an additional 5 cm insulation (total 27 cm wall insulation)
- Ceiling closure and 35–40 cm ceiling insulation
- Electrical and plumbing installation
- Heating system with mobile app control
- Fermacell boards on walls, plasterboard on ceilings
- Cement screeds
- Attic ladder
Turnkey Finish
(net + 8% VAT)
Includes Developer Stage, plus:
- Wall and ceiling finishes
- Bathroom fit-out
- Floor and door installation
- Lighting installation
- Kitchen installation
Download Full Offer
Stay in touch and download the complete catalog containing all of our house designs along with detailed pricing.
![Modularen - Prefabrykowany dom parterowy [Grand House 59] - 2](https://www.modularen.com/wp-content/uploads/2024/12/Modularen-Prefabrykowany-dom-parterowy-Grand-House-59-2-scaled.jpg)
Premium Standard Wall System
Discover our heavy timber prefabricated wall system
Exterior Wall with Timber Cladding [40 cm]
- Scandinavian spruce cladding, tongue and groove
- Battens and counter-battens
- Tyvek Housewrap windproof membrane
- Steico / Naturheld wood fibre insulation board
- C24 KVH finger-jointed structural timber
- Mineral wool insulation
- MFP P5 structural stiffening board
- Steico Multi Membra 5 vapour barrier membrane
- Service cavity
- Mineral wool insulation
- Fire-resistant, moisture-resistant Fermacell board
[mm]
22
38 x 58 x 2
–
60
60 x 160
160
12
–
60 x 60
50
12,5
Robust structure built using German heavy timber frame technology
We build our walls using certified KVH structural timber, finger-jointed and glued, with a cross-section of 60 x 160 mm. This timber contains 47% more raw material than standard Scandinavian beams with a 45 x 145 mm cross-section. The more massive wall structure significantly improves the building’s statics and the mechanical performance of structural joints.
Additionally, instead of standard gypsum plasterboard, we use Fermacell gypsum fibre boards as the interior wall finish. Fermacell boards are twice as dense and therefore significantly harder than standard plasterboard, which greatly improves the building’s structural performance and fire resistance. These boards are also moisture-resistant, making them suitable for wet areas.
Our German heavy frame construction system, combined with double wall stiffening using Fermacell and MFP P5 boards, ensures that our buildings meet the requirements of Poland’s highest wind and snow load zones as standard.
Vapour-open construction in accordance with building physics
The walls and roofs of our houses are additionally insulated with 6.0 cm thick Steico insulation boards. This results in a total wall insulation thickness of 27.0 cm [Uw = 0.135 W/m²K] and roof insulation of 30.0 cm [Uw = 0.126 W/m²K]. These boards significantly improve the thermal transmittance coefficient (Uw) of the building envelope and, due to their high specific heat capacity (Cw), also protect against overheating in summer. Additionally, they enhance acoustic insulation.
As a result, our homes qualify as premium in terms of both energy efficiency and soundproofing. Wood fibre boards are vapour-open materials that can be installed on the exterior side of the structure. Unlike polystyrene or OSB boards, which block moisture escape when placed on the exterior, wood fibre boards allow for proper moisture diffusion, significantly extending the life of the structure and preventing mould and mildew growth.
Installation Cavity for Electrical and Plumbing Systems
The installation battening we use on the interior side of the walls serves as a dedicated space for mounting electrical boxes, running cables in conduits, and concealing water pipes. This additional installation cavity is designed to protect the vapour barrier from being punctured.
Failing to use an installation cavity—and instead embedding installations directly into the main wall structure—leads to puncturing the vapour barrier. This allows water vapour to penetrate the structure and the main insulation layer, ultimately degrading the wall system and contributing to mould and mildew growth within the building.
The installation cavity eliminates this issue by preserving the continuity and airtightness of the vapour barrier, as all utilities are placed within the secondary battening layer. This cavity also provides an additional 5 cm layer of insulation.
Thanks to this wall system design and the high quality of materials we use, we confidently offer a 30-year warranty on the structural integrity of our homes.
Premium Standard Wall System
Discover our heavy timber prefabricated wall system
- Scandinavian spruce cladding, tongue and groove
- Battens and counter-battens
- Tyvek Housewrap windproof membrane
- Steico / Naturheld wood fibre insulation board
- C24 KVH finger-jointed structural timber
- Mineral wool insulation
- MFP P5 structural stiffening board
- Steico Multi Membra 5 vapour barrier membrane
- Service cavity
- Mineral wool insulation
- Fire-resistant, moisture-resistant Fermacell board
22
38 x 58 x 2
–
60
60 x 160
160
12
–
60 x 60
50
12,5
Exterior Wall with Timber Cladding [40 cm]
Robust structure built using German heavy timber frame technology
We build our walls using certified KVH structural timber, finger-jointed and glued, with a cross-section of 60 x 160 mm. This timber contains 47% more raw material than standard Scandinavian beams with a 45 x 145 mm cross-section. The more massive wall structure significantly improves the building’s statics and the mechanical performance of structural joints.
Additionally, instead of standard gypsum plasterboard, we use Fermacell gypsum fibre boards as the interior wall finish. Fermacell boards are twice as dense and therefore significantly harder than standard plasterboard, which greatly improves the building’s structural performance and fire resistance. These boards are also moisture-resistant, making them suitable for wet areas.
Our German heavy frame construction system, combined with double wall stiffening using Fermacell and MFP P5 boards, ensures that our buildings meet the requirements of Poland’s highest wind and snow load zones as standard.
Vapour-open construction in accordance with building physics
The walls and roofs of our houses are additionally insulated with 6.0 cm thick Steico insulation boards. This results in a total wall insulation thickness of 27.0 cm [Uw = 0.135 W/m²K] and roof insulation of 30.0 cm [Uw = 0.126 W/m²K]. These boards significantly improve the thermal transmittance coefficient (Uw) of the building envelope and, due to their high specific heat capacity (Cw), also protect against overheating in summer. Additionally, they enhance acoustic insulation.
As a result, our homes qualify as premium in terms of both energy efficiency and soundproofing. Wood fibre boards are vapour-open materials that can be installed on the exterior side of the structure. Unlike polystyrene or OSB boards, which block moisture escape when placed on the exterior, wood fibre boards allow for proper moisture diffusion, significantly extending the life of the structure and preventing mould and mildew growth.
Installation Cavity for Electrical and Plumbing Systems
The installation battening we use on the interior side of the walls serves as a dedicated space for mounting electrical boxes, running cables in conduits, and concealing water pipes. This additional installation cavity is designed to protect the vapour barrier from being punctured.
Failing to use an installation cavity—and instead embedding installations directly into the main wall structure—leads to puncturing the vapour barrier. This allows water vapour to penetrate the structure and the main insulation layer, ultimately degrading the wall system and contributing to mould and mildew growth within the building.
The installation cavity eliminates this issue by preserving the continuity and airtightness of the vapour barrier, as all utilities are placed within the secondary battening layer. This cavity also provides an additional 5 cm layer of insulation.
Thanks to this wall system design and the high quality of materials we use, we confidently offer a 30-year warranty on the structural integrity of our homes.